I've never seen or heard anyone going on dates. By date, I mean going to a coffee shop and have a coffee and chat. That's too boring I guess, or I don't know; maybe it's not in their culture. I've only seen people go on dates in movies.

My question is:

Let's say I get a girl's number. Should I invite her to my dormitory to cook something together, then escalate and have sex with her?

Another problem that I have is that when I ask a girl's number after chatting with her for a while on the street/bar/party she says "I don't know you. I don't give my number to people." She says that even after I make her laugh. How do I deal with this?